/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' /tmp/ccWj0mz4.o: In function `ft_print_words_tables': sudoku.c:(.text+0x32): undefined reference to `ft_putchar' sudoku.c:(.text+0x4a): undefined reference to `ft_putchar' collect2: ld returned 1 exit status